Having several issues...
First, A 100 gal FOWLR, sump, water params perfect... In this tank I had a powder brown, 2 yellow tangs, a purple tang, a midas blenny, a fiji foxface, 2 pajamas, a flame angel, a coral beauty and 4 cleaner shrimp along with others you'd find in a clean-up crew. Had a problem with ich (obviously from stress of 4 tangs but all but pb were small, between 2-3 inches.)
OK, so the ich is 1 thing... Brine shrimp was being soaked in garlic and all were eating like little piggies. Approx 2.5 weeks before "the incident" i noticed a film covering the rocks. a flowy, clear but noticeable film. Guy at LFS tests my water himself, says everything perfect and this film is anaerobic die-off, increase the flow in the tank and it'll go away and will not kill my fish. 2 weeks later, 2 of my fish quit eating. Next day, dead. Everyone else in the tank ate that day... that night. Boom. Next morning, everything but the fiji, the blenny, the 4 cleaner shrimp and 1 yellow tang are dead (again, they all ate that morning). I tested my water after removing bodies, ammonia barely off (b/c of the bodies i assumed) everything else, perfect.) Could it be the ich? Shouldn't kill like that especially since all were actively swimming and eating.
Following advice (not of the LFS), I xfer the remaining fish to a 55gal and start medicating for the ich (b/c it still can't possibly be related to this film) and the tank needs to set. The blenny dies that night (likely the stress from move). I used the "all-natural ich attack" i'd found for 2.5 weeks and the ich never fully went away. And in the 100 gal, the film remains to this day despite adding 2 more powerheads to the 2 I'd had in there already b/c i needed "more... more is better". I do have pics of this film I'll try and pull off my camera in the morning.
I've since moved the fiji and tang back into 100 gal where the shrimp have resided through it all, and he's doing fine. Still with the occasional spot or 2 of ich but not rubbing on anything. Today I, against my better judgement, added a couple newbies. Still having doubts about this film though. It's not killed the foxface yet, but they're really hardy anyway. Any thoughts?

please include actual tank water parameters.will help me and others understand your system better. why aren't you testing your own water? go buy some test kits and maintain those params yourself. easier to isolate problems when YOU know whats out of whack right?...

also how long has the tank been setup? what do you have for filtration? got skimmer? are you doind water changes? how regularly?

how were the fish added? all at once ? two at a time? one by one?...

sounds like a spike in excess nutrients or mayb stray voltage. hard to say.ich is not as big as an issue as some think. all you have to do is keep the fish well fed and water prestine and ich won't stand a chance. by the way what was the main diet of your fish? tangs mainly. were they only getting brine in garlic?

the film is likely not the culprit to the deaths.what color is the film? im thinking cyanobacteria or diatoms or maybe dinoflagelates

please include actual tank water parameters.will help me and others understand your system better. why aren't you testing your own water? go buy some test kits and maintain those params yourself. easier to isolate problems when YOU know whats out of whack right?... I do test my own water, prob more than I have to, even down to the calcium which I'm told doesn't particularly matter in FOWLR.LFS thought I was crazy I think so they asked to test it themselves. Ammonia was always 0. Nitrite 0 Nitrate always between 0 and 10. Phos 0 Calcium as high as 500. PH 8.2-8.4 Salinity (LFS refractometer) up to 1.024. Something else they'd suggested to help with ich was to lower the salt to .021... they actually said .019 but i have cleaner shrimp so :-/. .021 it was, still is actually. Took 2-3 gals, slowly of course and replaced with RO until .021 was reached.

also how long has the tank been setup? Over 2 years. what do you have for filtration? Just sand/rock and carbon. Sump is 30ish gallons. got about 15-20 lbs of LR in sump alone and another 135 to 145 in tank. got skimmer? Unfortunately not for this tank. Fixing to start upgrading systems. Carbon is changed like crazy (bi-weekly usually, which is again prob more than recommended but I'm at a loss so of course I'm going off what LFS man said to do. are you doind water changes? No, not regularly anyhow. In this tank I've never had a problem with anything but major error. (i.e. kid dumped a pitcher of soap water into sump... bad news) how regularly? <--In situations like that. LFS man has always told me they never do them, he sees no reason to do them unless you basically have to.

how were the fish added? all at once ? two at a time? one by one?... usually 3 at a time, sometimes 2, never just 1. To decrease the focus on just 1 fish. I'm confident that what started it was aggression... just don't know why it didn't stop when the tang's had settled down.

sounds like a spike in excess nutrients or mayb stray voltage. hard to say.ich is not as big as an issue as some think. all you have to do is keep the fish well fed and water prestine and ich won't stand a chance. by the way what was the main diet of your fish? Brine/mysis soaked in garlic pretty much daily. Purple algae every 3 days. They almost never left any leftovers besides what the overflow sucked up before they got to it. I'd been told by LFS man not to feed daily, and I tried that... but they just seemed more irritable, so I went back to everyday just smaller amounts. tangs mainly. were they only getting brine in garlic? No, I know feeding the kids pizza everyday gets old.

the film is likely not the culprit to the deaths.what color is the film? im thinking cyanobacteria or diatoms or maybe dinoflagelates it's still present in tank, looks like flowy clear snot (couldn't think of anything better) on the rocks and return. None on the sand, glass or any of the powerheads mentioned in story. Will post a pic as soon as i find camera. Looking now. I've never, never ever had a problem with algae in this tank, in fact coraline is barely present and my calcium had previously been as high as 640 (at the beginning of addiction before I had any reminense of an idea what I was doing).

Having several issues...
First, A 100 gal FOWLR, sump, water params perfect... In this tank I had a powder brown, 2 yellow tangs, a purple tang, a midas blenny, a fiji foxface, 2 pajamas, a flame angel, a coral beauty and 4 cleaner shrimp along with others you'd find in a clean-up crew. Had a problem with ich (obviously from stress of 4 tangs but all but pb were small, between 2-3 inches.)
OK, so the ich is 1 thing... Brine shrimp was being soaked in garlic and all were eating like little piggies. Are you feeding them other foods besides the brine, like mysis, nori, pellets? Try adding some selcon to the food as well. Approx 2.5 weeks before "the incident" i noticed a film covering the rocks. a flowy, clear but noticeable film. Guy at LFS tests my water himself, says everything perfect and this film is anaerobic die-off, increase the flow in the tank and it'll go away and will not kill my fish. 2 weeks later, 2 of my fish quit eating. Next day, dead. Everyone else in the tank ate that day... that night. Boom. Next morning, everything but the fiji, the blenny, the 4 cleaner shrimp and 1 yellow tang are dead (again, they all ate that morning). I tested my water after removing bodies, ammonia barely off (b/c of the bodies i assumed) everything else, perfect.) Could it be the ich? Shouldn't kill like that especially since all were actively swimming and eating.
Following advice (not of the LFS), I xfer the remaining fish to a 55gal and start medicating for the ich (b/c it still can't possibly be related to this film) and the tank needs to set. The blenny dies that night (likely the stress from move). I used the "all-natural ich attack" i'd found for 2.5 weeks and the ich never fully went away. And in the 100 gal, the film remains to this day despite adding 2 more powerheads to the 2 I'd had in there already b/c i needed "more... more is better". I do have pics of this film I'll try and pull off my camera in the morning.
I've since moved the fiji and tang back into 100 gal where the shrimp have resided through it all, and he's doing fine. Still with the occasional spot or 2 of ich but not rubbing on anything. Today I, against my better judgement, added a couple newbies. Still having doubts about this film though. It's not killed the foxface yet, but they're really hardy anyway. Any thoughts?

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I do not think the film plays a part in the demise of the fish. You may or may not have Marine Ich or another pathogen or a combination of a couple.

Your right stress will usually make the already present disease symptomatic.

Honestly is sound like you are not getting good advice from the LFS regarding disease identification or treatment for Marine Ich. Lowering the salinity to 1.021 will do nothing to treat for the disease.

Good luck with the new additions, I would really try to enhance their diet with some selcon and other foods besides brine.

The only way to get a handle on how to deal with Marine Ich is to research it. This link provides some of the facts regarding it.

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